International Journal of Trend in Scientific
Research and Development (IJTSRD)
International Open Access Journal
ISSN No: 2456 - 6470 | www.ijtsrd.com | Volume - 2 | Issue – 5
Beneficial Usage
sage of Autoclaved Aerated Concrete Block
Khin War Oo1, Su Nandar Hlaing2
1
Lecturer, 2Assistant Lecturer
Department of Mechanical Engineering, Yangon Technological University
University, Yangon,
Yangon Myanmar
ABSTRACT
This paper is about the study of beneficial usage of
AAC block production in Mother Industrial Co., Ltd
(AAC and APC block factory). Autoclaved Aerated
Concrete is one of such green materials.
ials. It not only
uses the waste material like fly ash but also provides
adequate strength to structures. The main aim of this
paper is to show the beneficial usage of AAC block
instead of the use of conventional brick. For that, the
beneficial usage of AAC
C block is showed on many
ways. The beneficial usage of AAC block shows the
cost saving calculation of AAC block. As the next
way, the beneficial usage of AAC block shows the
weight saving calculation of AAC block. Quality
control chart (x bar and R chart) use to prove the
benefit of AAC blocks in checking the production
process. The other way is the compressive strength
calculation between conventional brick and AAC
block to show the benefit of AAC block. Finally, the
power consumption cost saving calculat
calculation of AAC
block compared with conventional brick is to show
the benefit of AAC block.
Keywords: aerated concrete block, beneficial usage,
cost saving, compressive strength, weight saving,
power consumption cost
I.
INTRODUCTION
It is very essential for human beings to live in a
building in the world. Man has used brick for building
purpose for thousands of years. Bricks dated back to
7000 BC, which makes them one of the oldest known
building materials. There were discovered in so
southern
turkey at the site of an ancient settlement around the
city of Jericho. The first bricks were sun
sun-dried mud
bricks. Fired bricks were found to be more resistant to
harsher weather conditions, which made them a much
more reliable brick for use in permanent
rmanent buildings,
where mud bricks would not have been sufficient.
Fired brick were also useful for absorbing any heat
generated throughout the day, then releasing it at
night.
The autoclaved aerated concrete block has its obvious
advantages of higher strength to weight ratio, better
tensile strain capacity, lower coefficient of thermal
expansion, and enhanced heat and sound insulation
characteristics due to air voids in the concrete. [1]
Autoclaved aerated concrete blocks can be applicable
in construction
ion engineering (compensation for the
foundation, pipeline backfilling, roof insulation, etc.),
but also get some application result in infrastructure
facilities (such as bridge and culvert backfill, road
widening, resolving bumping at bridge-head
bridge
of soft
base embankment. [2]
Brick are one of the most building materials in the
India. In recent years, with expanding urbanization
and increasing demand for construction materials,
brick kilns have grown to meet the demand. It has
directly or indirectly caused a series of environmental
and health problems. At a global level, environmental
pollution from brick- making operations contributes to
the phenomena of global warming and climate
change.[3] Brick which form an extremely important
part of the Indian construction
ction industry have many
disadvantages. The brick kilns cause air pollution
which not only affects humans but also vegetation and
agriculture. Large amount of carbon dioxide and other
harmful gases lead to the menace of global warming
and climate change. Also
lso the precious soil used for
brick making could be better used for agriculture and
thus providing food security to the increasing
population [4].
@ IJTSRD | Available Online @ www
www.ijtsrd.com | Volume – 2 | Issue – 5 | Jul-Aug
Aug 2018
Page: 1961
International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
The determination of using brick with optimal quality
and energy saving is needed to be a strong building.
This thesis is to study a comparison between
conventional brick and the benefit of autoclaved
aerated concrete block on the environment.
II.
MANUFACTURING
AAC can be used as walls, partitions, floor and roof
decks, and other building components, or as an
integrated system for structures up to seven stories
high. It is substantially unaffected by shrinkage,
moisture, decay, termites and other common causes of
building deterioration and it is environmentally
“green” building material because it is easily recycled
back into its own production process. AAC also
appears to be a cost comparative building material and
ease of cutting boots construction productivity.
A. Equipment List
The equipment list are sand ball mill (wet), jaw
crusher (Lime Section), Fly-ash, slurry storage mixer,
mixer scale, pouring mixer, mould box, hydraulic
frequency conversion, cutting cart, horizontal cutting
machine, vertical cutting machine, reversal table,
transporting crane or grouping crane, steam curing
trolley, autoclave, boiler and separating machine.
B. Raw Materials Used in the Manufacture of
AAC Block
Cement: Portland cements is generally preferred
over other types of cements.
Water: Portland water should be used which, must
conform with the general requirements of the
concrete.
Sand: It is an important raw material in the
manufacture of AAC Blocks.
Quick Lime: Lime powder required for ACC
production is obtained either by crushing
limestone to fine powder at AAC factory or by
directly purchasing it in powder from a vendor.
Gypsum: Gypsum is easily available in the market
and is used in powder form. It is stored in silos.
Aluminium Powder
C. Procedure
Milling, Mixing, Pouring; Sand and water is
milled by the Wet Ball Milland the slurry is put
into the slurry pond and it is stored into the slurry
tank and the slurry is put into the slurry tank and
the slurry is put into the Pouring Mixer. Gypsum
is crushed by Jaw Crusher and Gypsum ponder is
stored into the silo and it is put into the Pouring
Mixer. Sand and water and Gypsum is mixed into
the Pouring Mixer for 40sec.Cement is stored into
the silo and it is put into the Pouring Mixer. Lime
is crushed by the Jaw Crusher and lime is milled
by the Dry Ball Mill and it is stored into the silo
and it is put into the Pouring Mixer. Cement and
Lime is mixed into the Pouring Mixer and the
time is for one min. To get the aluminium
mixture. We have to open the temperature bar and
adjust the temperature to 42℃ keep it about
15sec.Finally we mixed sand, water and gypsum
mixture, Aluminium and water mixture. The
mixture keep it about 40sec.We have the
temperature must put to watch the temperature
right to about 47℃ and is put into the mould and
dry in the curing room where the temperature is
about 50 to 55℃.Block must be lifted with a
reversal crane. Block must be lifted with a
reversal crane.
Cutting and Distilling: The block is cut with a
horizontal cutting machine and then cut with
vertical cutting machine to get a suitable size and
the extra art is cut with Bottom wipe off crane and
the block must be distilled in autoclave.
Separating: Block must be separated and we can
get the block which we want to build.
D. Size of AAC Block
The photographic view of the AAC blocks (1) length600mm, height-200mm, thickness-200mm, Cost-1800
kyats and (2) Length-600 mm, Height-200 mm,
Thickness-100 mm, Cost-950 kyats are shown in
Figures 1 and 2.
Fig.1. AAC block
Fig.2.AAC block
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
III.
COMPARISONS
1. First is the cost saving calculation of AAC block
compared with conventional brick for building a
wall that have 100 ft2 to prove the benefit of AAC
block.
2. Second is the weight saving of AAC block
compared with conventional brick base on a wall
that have 100ft2 to prove the benefit of AAC
block.
3. Third is the compressive strength calculation
between conventional brick and autoclaved
Material
Clay Brick
Cement
Sand
Mason
Worker
AAC Block
AAC Mortar
Mason
Worker
aerated concrete block using method of sampling
and testing.
4. Fourth is the power consumption cost saving
calculation of AAC block compared with
conventional brick
5. Fifth is calculating the cost saving of AAC block
need the cost data of raw materials for AAC block
and conventional brick and other requirement
data. Following data got from Mother Industrial
Co., Ltd (AAC and APC Block factory) and other
constructional sides.
TABLE I: COST SAVING CALCULATION OF AAC BLOCK
Qty
Price
Total
Grand Total
Remark
490 Pieces
110
53900
(228.6× 101.6 × 76.2)
2.7 Bags
5,600 15,120
0.1 Sud
14,000 1,400
2
12,000 24,000
6hrs
4
8,000 32,000
6hrs
2
126420 126420(for 100ft )
2
For 1ft of Clay brick=1264.2Kyats
70 Blocks
1,000 70,000
(600× 200 × 100)݉݉
1 Bag
7,000
7,000
40kg/bag
1
12,000 12,000
2hrs
2
8,000 16,000
2hrs
105,000 105,000(for 100ft2)
For 1ft2of AAC block=1050Kyats
Difference Cost
21420(100ft2)
Cost saving of AAC=1264.2-1050=214.2Kyats/ft2
6. Sixth is calculating the weight saving of AAC block need the weight data of raw materials for AAC block
and conventional brick and other requirement data. Following data got from Mother Industrial Co., Ltd
(AAC and APC Block factory) and other constructional sides.
TABLE II: WEIGHT SAVING CALCULATION OF AAC BLOCK
Material
Qty
Weight
Total
Grand Total
Clay Brick
490 Pieces
2.5kg
1,225 kg
Cement
2.7Bags
50kg
135kg
Sand
0.1sud
3,500 kg
350kg
Remark
<12mm joint Thk
1,710kg(100ft2)
1,710 kg
For 1 ft2 of Clay brick=17.1kg
AAC Block
70 Blocks
9kg
630kg
AAC Mortar
1 Bag
40kg
40kg
670kg
(Wet Weight)
<3mm Joint Thk
2
670kg(for 100ft )
2
For 1 ft of AAC block=6.7kg
Difference Weight=1040 kg
The cost saving of AAC block=17.1-6.7=10.4 kg
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
2456
7. Seventh is the compressive strength calculation
comparison between conventional brick and
autoclaved aerated concrete block need the size of
AAC block and conventional brick. The following
data got from Mother industrial Co., Ltd (AAC
and APC block factory) and other construction
shop.
The compressive strength calculation of conventional
brick
Surface area= length ×width – (Hole’s surface)
గ
=220×100- ( ସ × ݀ ଶ × 10
=22000mm2- (/4 252×10)
=17091.26mm2
Force is attained by testing the conventional brick.
P=
F
A
Where,
P=compressive strength, F=force, A=area
A=17091.26 mm2
TABLE III: COMPRESSIVE STRENGTH
CALCULATION OF CONVENTIONAL BRICK
Force
Compressive= force
No
Area (mm2)
(N)
(N/mm2)
area
1
75840
17091.26
4.437
2
72510
17091.26
4.2425
3
71920
17091.26
4.207
For Autoclaved aerated concrete block
Dimension=100×100×100
Surface area=100×100×100=10000mm2
Force is attained by testing the autoclaved aerated
concrete block.
No
1
2
3
TABLE IV: COMPRESSIVE STRENGTH
CALCULATION OF AAC BLOCK
Compressive
Force
Area
strength=
force
(N)
(mm2)
2
(N/mm ) area
55600
10000
5.56
56100
10000
5.61
57200
10000
5.72
The bar graph of compressive strength calculating
result between conventional brick and AAC block
10
5
0
1
2
Conventional brick
3
AAC block
Fig3The bar graph of compressive strength
comparison result
E. Benefits of AAC Block
The benefits of AAC block are workability, moisture
resistance, water saver, less weight, acoustically
absorbent and environment friendly, pest resistance,
long lasting, weather and earthquake resistance,
energy saving, faster construction and cost saving.
1. Workability
Blocks can be easily cut, drilled, nailed, milled
and grooved to fit individual requirement. It is
also available in custom sizes subject to
negotiation.
2. Moisture Resistance
AAC blocks resist with moisture. Because AAC
blocks have very less water absorption compared
to other bricks.
3. Water Saver
The properties of water are very good. In
construction, AAC block require less water
compare with clay brick and other traditional
bricks during curing; plastering and laying
process.
4. Less Weight
AAC blocks have 1/3 density compared to clay
bricks. Hence, AAC blocks are very light weight
materials.
V.
CASE STUDY
A case study is made at Mother Industrial Co., Ltd,
AAC and APC block Factory, situated at Pa-Le-Road
Pa
(Opposite of MEC Tyre Factory), PhawtKan, Insein
In
Township, Yangon Division, Myanmar, which
manufactures two different types of block. They are
Autoclaved Aerated Concrete block (AAC block) and
Autoclaved Pressed Concrete brick (APC).In many
types of Autoclaved Aerated Concrete block
productions, thiss paper only based on Autoclaved
Aerated Concrete block production process. For a
day, they can produce around 14112 blocks depending
upon customer demand. The information and data are
obtained from this factory for this paper.
VI.
CONCLUSION
This paper is studied on the beneficial usage of AAC
block Production Process from Mother Industrial Co.,
Ltd. (AAC and APC block factory).The cost of AAC
block for building a wall that have 100ft2 is lower
than the cost of conventional brick. The weight of
AAC block to build a wall that have 100ft2 is less than
the weight of conventional brick. The compressive
strength of AAC block is higher than the compressive
strength of conventional brick. So the quality of AAC
block is better than the conventional brick. So, the use
@ IJTSRD | Available Online @ www
www. ijtsrd.com | Volume – 2 | Issue – 5 | Jul-Aug
Aug 2018
Page: 1964
International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
of AAC block instead of the use of conventional brick
is more benefit.
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